Hand puller with a structure of double stopping plates

ABSTRACT

A hand puller with the structure of double stopping plates is disclosed. An axle part goes through a fixing part and a pulling part. Both ends of the axle part have a ratchet, respectively. The fixing part has two stopping plates, fixed to the two opposite sides of the axle part. The pulling part has a driving claw. The driving claw and the stopping plates of the fixing part engage with the ratchet.

BACKGROUND OF THE INVENTION

1. Field of Invention

The invention relates to a hand puller and, in particular to a handpuller with an improved structure of double stopping plates.

2. Related Art

FIG. 11 shows a conventional hand puller. Its fixing part 80 and pullingpart 81 are joined with an axle part 82. The axle part 82 has a ratchet83. The fixing part 80 has a stopping plate 85. The pulling part 81 hasa driving claw 86. The stopping plate 85 and the driving claw 86 engagewith the ratchet 83.

As shown in the structure, the puller has only one stopping plate 85.The stopping plate 85 may not accurately engage with the ratchet 83because there is some variation in the tooth span. When the puller istightened, the stopping plate 85 may depart from the ratchet so that thestrap falls off.

FIG. 12 shows another conventional hand puller. The fixing part 90 hastwo stopping plates 91 installed on the same side of the ratchet 92.They engage with the ratchet 92 from top and bottom, respectively, toachieve strap tightening.

However, the stopping walls on both sides of the fixing part 90 have tobe higher so that the two stopping plates 91 can be installed on thesame side of the ratchet 92. The structure of the fixing part 90 is thuslarger than the fixing part with one stopping plate. This increases thecost of the hand puller. Besides, when the hand puller relaxes thestrap, one sometimes has to do it slowly. During the slow strap releaseof the hand puller with two stopping plates 91, the user has to pull thepulling part 93 so that the two stopping plates 91 back their teeth oneby one. Without appropriate control, the strap may be released too much.

Therefore, it is an objective of the invention to solve the problems inthe conventional hand puller.

SUMMARY OF THE INVENTION

An objective of the invention is to provide a hand puller with astructure of double stopping plates to achieve the effect of engagingand stopping its ratchet with the two stopping plates when the handpuller holds its strap.

Another objective of the invention is to provide a slow strap releasemechanism at the fixing part so that the driving claw of the pullingpart can shift in the stroke and the ratchet can back the strap outtooth by tooth.

To achieve the above objectives, the invention has an axle part betweena fixing part and a pulling part. Both ends of the axle part have aratchet. The fixing part has a stopping plate. The pulling part has adriving claw. The stopping plates and the driving claw engage with theteeth of the ratchets, respectively.

Moreover, the fixing part has a stopping plate on the opposite sides ofthe axle part. When the driving claw rotates the ratchet, the stoppingplate on one side of the ratchet engages the bottom part of the teeth ofthe ratchet. The stopping plate on the opposite side of the ratcheturges against the top part of the teeth the ratchet. The two stoppingplates thus move reciprocally between the top and bottom parts of theteeth.

At the pivotal axle part, the fixing part has a guiding section for thedriving claw to urge while pulling. The guiding section has a stoppingwall for the driving claw to urge at the end of the stroke. Apositioning groove is formed above the stopping wall. A sliding grooveis formed between the positioning groove and the guiding section.

The driving claw drives the ratchet to rate during the stoke of theguiding section and urges against the stopping wall when it is fullypulled. When the driving claw is pulled up to the positioning groove anddisposed therein, it completely departs from the ratchet. Two protrudingparts are disposed corresponding to the two stopping plates at the axlepart of the pulling part. When the driving claw moves back and forth inthe sliding groove, the two protruding parts push away the correspondingstopping plates. The teeth of the ratchet thus back out the strap toothby tooth.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will become more fully understood from the detaileddescription given herein below illustration only, and thus is notlimitative of the present invention, and wherein:

FIG. 1 is a three-dimensional view of the invention;

FIG. 2 is a three-dimensional exploded view of the invention;

FIG. 3 is a side view of the structure of the invention;

FIG. 4 is a schematic view of the pulling part being pulled up accordingto the invention;

FIG. 5 is a schematic view of the disclosed driving claw at the frontend of the sliding groove;

FIG. 6 is a schematic view of the disclosed driving claw at the back endof the sliding groove;

FIG. 7 is a schematic view of the driving claw in the positioninggroove;

FIG. 8 is a schematic view of the relative position of the disclosed twohand puller before they are combined;

FIG. 9 is a schematic view of the assembled two hand puller according tothe invention;

FIG. 10 is a three-dimensional view of a second embodiment of theinvention;

FIG. 11 is a schematic view of a conventional hand puller; and

FIG. 12 is a schematic view of another conventional hand puller.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will be apparent from the following detaileddescription, which proceeds with reference to the accompanying drawings,wherein the same references relate to the same elements.

Please refer to FIGS. 1 to 7 for an embodiment of the invention. It isused only for the illustration purpose. The invention is not restrictedto such a structure.

This embodiment provides an improved hand puller. An axle part 3 goesthrough a fixing part I and a pulling part 2. Both ends of the axle part3 are provided with a ratchet 4, respectively. The fixing part 1 hasstopping plates I1. The pulling part 2 has a driving claw 21. Thestopping plate 11 and the driving claw 21 engage with the teeth 41 ofthe ratchet 4. As shown in FIG. 2, the pulling part 2 can depart fromthe fixing part 1.

The fixing part 1 has a stopping plate 11 ob opposite ends of the axle3, respectively. When the driving claw 21 drives the ratchet 4, thestopping plate 11 on one side of the ratchet 4 engages with the bottompart 41a of the teeth 41 of the ratchet 4. The stopping plate 11 on theopposite side of the ratchet 4 urges against the top part 41 b of theteeth 41 of the ratchet 4. The two stopping plates 11 alternatelyperform a reciprocal motion between the bottom part 41 a and the toppart 41 b of the teeth 41.

As shown in FIGS. 3 to 7, the fixing part I has a guiding section 12 atthe pivotal axle part 3 for the end of the driving claw 21 to urgeagainst when it is pulled. The guiding section has a stopping wall 13for the sidewall of the driving claw 21 to urge and stop at the end ofits stroke. A positioning groove 14 is formed on the upper portion ofthe stopping wall 13. A sliding groove 15 is formed between thepositioning groove 14 and the guiding section 12.

According to the above-mentioned stricture (also shown in FIGS. 3 and4), the driving claw 21 drives the ratchet 4 during the stroke of theguiding section 12. It urges against the stopping wall 13 when fullypulled. The pulling part 2 is provided with two protruding parts 22 atthe axle part 3 corresponding to the two stopping plates 1 1. As shownin FIGS. 5 and 6, as the driving claw 21 moves back and forth in thesliding groove 15, the two protruding parts 22 push away thecorresponding stopping plates 11, respectively. The teeth 41 of theratchet 4 thus back out the strap tooth by tooth. As shown in FIG. 7,the driving claw 21 completely depart from the ratchet 41 when it ispulled and inserted into the positioning groove 14.

As shown in FIGS. 8 and 9, the fixing part 1 in this embodiment has twosets of through holes 16 in the back. The two sets of through holes 16are in communication when the fixing parts 1 of two hand pullers areconnected. Two sets of locking elements 17 go through and connect themin this case.

From the above description, it is easy to see that one advantage of theinvention is in that two opposite sides of the ratchet of the fixingpart 1 have a stopping plate, respectively. When the pulling part 2 ispulled, even if the teeth 41 on the ratchet have some variation in theirspan, the cooperation of the two stopping plates 11 still enable them toengage with the ratchet 4, preventing the strap from falling off. It isnot necessary to increase the height of the structure on both sides ofthe fixing part to accommodate the tho stopping plates 11 as in theprior art. The component cost is thus lower. Moreover, to prevent cargofrom shifting to one side and even toppling over because a single set ofhand puller impose a tightening force only in one direction, the fixingpart I of the invention can involve two sets of hand pullers connectedvia two sets of through holes 16. Therefore, the user can use the samepulling part 2 to drive two fixing parts 1, exerting a more uniformforce.

Of course, the invention has many other embodiments that only vary indetails. Please refer to FIG. 10 for a second embodiment of theinvention. The fixing part 1A are fixed to the pulling part 2A. That is,the fixing part 1A and the pulling part 2A cannot be separated. However,such a fixed-type hand puller still has the above-mentioned two stoppingplates 11A and achieves the slow strap backing effect.

Although the invention has been described with reference to specificembodiments, this description is not meant to be construed in a limitingsense. Various modifications of the disclosed embodiments, as well asalternative embodiments, will be apparent to people skilled in the art.Therefore, it is contemplated that the appended claims will cover allmodifications that fall within the true scope of the invention.

What is claimed is:
 1. A hand puller having the structure of doublestopping plates, comprising: a fixing part having stopping plates; apulling part having a driving claw; an axle part going through thefixing part and the pulling part, with a ratchet on each of its twoends; wherein the stopping plates are disposed on the two opposite sidesof the axle part, respectively; when the driving claw rotates theratchet, the stopping plate on one side of the ratchet engages with thebottom part of a tooth of the ratchet and the stopping plate on theopposite side urges against the top part of the tooth of the ratchet;the two stopping plates perform a reciprocal motion between the bottompart and the top part of the teeth; the fixing part has a guidingsection at the axle part for the end of the driving claw to urgeagainst; the guiding section has a stopping wall at the end of itsstroke for the driving claw to urge and stop; a positioning groove isformed in the upper portion of the stopping wall; and a sliding grooveis formed between the positioning groove and the guiding section; thedriving claw rotates the ratchet during the stroke of the guidingsection and urges against the stopping wall when fully pulled; thedriving claw departs from the ratchet when it is pulled up and disposedinto the positioning groove; two protruding parts are formedcorresponding to the two stopping plates on the pulling part at thejoint to the axle part; and when the driving claw moves back and forthin the sliding groove, the two protruding parts push away thecorresponding stopping plates so that the teeth of the ratchet back outthe strap tooth by tooth.
 2. The hand puller having the structure ofdouble stopping plates as in claim 1, wherein the fixing part has twosets of through holes in the back that are in communication when the twofixing parts of two hand pullers are connected, and two sets of lockingelements go through the through holes to join the hand pullers.
 3. Thehand puller having the structure of double stopping plates as in claim1, wherein the fixing part and the pulling part are connected in a fixedway.